class Main {
  public static void main(String [ ] args) {
      BookPage bp = new BookPage(1);
      Book b = new Book(10, bp);
      BookPage bp2 = new BookPage(2);
      BookPage bp3 = new BookPage(11);
      b.addPage(bp2);
      b.addPage(bp3);
      b.deletePage(bp3);
      b.changePage(bp2);
      b.changePages(1,2);
  }
}